After loading a meth pipe with fresh shards you need to melt them down to puddle and then blow all the residue smoke out while allowing the puddle to cool down. Once the puddle has cooled it will have become one giant crystal. What this does is allow you to burn some, if any cut off and also keeps the shards from flying in your mouth. You can now smoke your meth.
I just loaded a fat ass bowl of some of the best meth in town. Let me crack it back and hit it a couple times then I'll pass it to you.
by IcE_SmOkeR December 14, 2009
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To achieve deep penatration during sexual intercourse
"Can I crack the back tonight?"
"I got so deep last night it was like reading braille with my bell end"
by Mikey C Thafe August 8, 2006
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a term used when talking about an individual being good at sex.
"Ben isn't really appealing to the eye but he sure knows how to crack my back right " said Sally
by igotyourback December 8, 2015
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1. (noun) The white or gray film that forms on the inside of a glass dick after smoking crystal meth.

2. (verb) The act of "melting" the aforementioned film off of the glass dick while inhaling the resulting smoke in an attempt to get high after you've smoked all your d.

3. (verb) The action and reaction of recrystalization of crystal meth when melted completely and then cooled.
Look at all the crack back on the inside of this pipe! Someone must have smoked a teener to their dome.

My roomate smoked the rest of my shabs and now I'm stuck cracking back!

I can't believe this shit is good! It's actually cracked back!
by Shabarella June 29, 2005
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used to refer to women who have very flat asses. their lack of an ass makes it appear as though they just have a butt crack on their backs.
that skinny chick has a crack back.
by mr.pubes February 4, 2006
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A humpback (someone with a large hump on their back)who is either on crack or sells crack. They are most commonly found on street corners and in dark alleys. Almost every town has their own crack-back who supplys them with crack and/or a good laugh, because a guy with a big hump on his back is fuckin funny.
Erik- Dude, wanna go pwn those noobs jamie and heather in foosball again?
Jake- Hell yeah... but lets crackalax for an hour or so before we go
Erik- Aight. But where are we gonna get the crack mayne?
Jake- Don't worry i know this crack-back who is always hangin out behind taco bell... we can score some off him
Erik- Word.
by Wlnga September 24, 2006
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when someone has a butt-thigh

small, flat, ass that merges with the back/thighs

person without a baadonk,a butt that is not able to be seen
"she's got a crack in the back"
"what"
"it's not called a butt, its just a crack in da back"
by raycbdot July 14, 2007
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